Activate Grand Architect's first activated ability by paying {U}, making Pili-Pala blue until end of turn.
Activate Grand Architect's last ability by tapping Pili-Pala, adding {C}{C} that can only be spent to cast artifact spells or activate abilities of artifacts.
Activate Pili-Pala by paying {2} and untapping it, generating {U}.
Repeat from step 2 any number of times.

Infinite blue mana

Pili-Pala

Grand Architect

Activate Urza's first ability by tapping Pili-Pala, adding {U}.
Activate Pili-Pala by paying {1} and untapping it, adding one mana of any color.
Repeat.
Once you have infinite mana, you may use it to activate Urza's ability.

Cast all cards in your library without paying their mana costs

Infinite colored mana

Exile your library

Urza, Lord High Artificer

Training Grounds

Power Artifact

Heartstone

Activate Pili-Pala by tapping it, adding {G}{G}.
Activate Pili-Pala by paying {2} and untapping it, adding one mana of any color.
Repeat.

Careful Cultivation

Activate Pili-Pala by tapping it, adding {2} and causing the next spell you cast to have cascade.
Activate Pili-Pala by paying {2} and untapping it, adding one mana of any color.
Repeat.
Optionally, you may cast any spell to get infinite cascade triggers based off the mana value of that spell.

Infinite cascade with mana value equal to the next spell you cast

Bigger on the Inside

Biomancer's Familiar

Agatha of the Vile Cauldron

Activate Urza's first ability by tapping Pili-Pala, adding {U}.
Leyline of Abundance triggers, adding {G}.
Activate Pili-Pala by paying {2} and untapping it, adding one mana of any color.
Repeat.
Once you have infinite mana, you may use it to activate either Urza or Leyline of Abundance's abilities.

Infinite +1/+1 counters

Near-infinite storm count

Leyline of Abundance

Cast the instant or sorcery by paying its mana cost.
Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery.
Resolve the copy of the instant or sorcery, untapping Stella Lee.
Repeat from step 2.

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